Transvalvular mean pressure gradient (MPG) measured by
CMR often underestimates echo-Doppler MPG. This underestimation might be due
to physical factors as flow turbulence generated downstream the severe AS,
local signal loss, background noise and phase wrap. However fluid dynamic
parameters may play also a significant role in the MPG measurement by CMR.
The aims of this study were to identify the fluid dynamic factors associated
with MPG underestimation by CMR and to investigate the association of those
factors in the AS severity assessment by CMR.